[x264-devel] MMCO bpyramid DPB

[Trahald]

The following patch removes the BRef produced by b-pyramid from the DPB at
the next P-frame via MMCO. It produced a small SSIM improvement in limited
tests. It also adds and option --strictdpb which removes the oldest
reference frame during BREFs (via MMCO when needed) to always reserve an
extra space in the dpb for delayed display time b-frames. This is only is
active when refs are 4+ since there isnt any room to give when refs = 3.
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